For me its a must do activity in Da Nang. This trip gives you great insights about how ancient people in Vietnam use to live and pray.
Marble mountain have some the most beautiful statues and caves and the most amazing part was the hiking and tor reach summit which goes through some very narrow parts and holes and you have to extremely careful. It was too fun climbing the summit.
Its worth a place to visit once and try hiking till summit.
Summit give beautiful bird eye view of the Da Nang City